Malicious PDF — malware analysis report

Static analysis result for SHA-256 0239689c18e2ec01…

MALICIOUS

PDF

74.8 KB Created: 2020-12-25 07:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ef77298871eb59a33fbb377795fced2f SHA-1: d7cebed0d1a2d3c927bdc2be527bff6843d4d238 SHA-256: 0239689c18e2ec017a28e0fbd1c8acc34ad140091c96a0591e3b1ad068f3de5a
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic suggests a large number of external links, likely for SEO manipulation or to distribute malicious content. The SE_URGENCY_LURE heuristic indicates the document may use time-sensitive language to prompt user interaction. No scripts were extracted, but the presence of malicious links strongly suggests an attempt to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?utm_term=world+of+submarines+navy+warships+battle+wargame In PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5fcc932709b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_5fbd9de4cac39.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/fb1f6f6.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/Qjdd3jb/85393361166.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/giibjij/my_city_bus_times_to_airport.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5fd6e2b061fc9.pdfIn PDF document text
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/wujare-jerepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87d56d6ffb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30af46dd-de7e-4e2b-85c2-823506711b48/hollow_knight_pantheon_charms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479275d8-40cf-4936-9276-6759e968a7df/cbse_class_10_exam_date_sheet_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8538cb87-0fd3-439a-afc3-9599e0ca658e/thiagarajan_viswanathan_solution_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db76083-6eae-47ab-bebc-11457eac92ed/jeguwaxuwabofonumedituso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bc03b9-94bd-4f61-8f50-947ef5240d46/biofax_forensic_bones_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/kubukuvufuwoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e92ce6a-fa49-425a-ac70-e53e1a719e2a/jefukopiwalaveleweruris.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5864 bytes
SHA-256: abe9efb702b0c50800c0c0389f6c52deb78c0579dbdd4422fb6bdc79d5c69e4e
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 11080 bytes
SHA-256: 0ff67f563c3cbf084c154564c9d5b1d9f08de160265a85e022a23afbab82abef

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